Manually generate the default config yaml, remove most of the commandline arguments for synapse anticipating that people will use the yaml instead. Simpify implementing config options by not requiring the classes to hit the super class

Key distribution v2

Conflicts:
	synapse/config/homeserver.py

Check that postgres database has correct charset set

contrib/systemd: add a sample systemd unit file and a logger configuration

The added logger configuration (--log-config or log_config:) uses
systemd's python bindings to pass messages directly to the journal.

Signed-off-by: Ivan Shapovalov <intelfx100@gmail.com>

general clean up. s/alpha/beta/g. add intelfx's AUR package for Arch. s/the homeserver/Synapse/g. move installation & running sections closer together.